Your organization can set its Lightning database preferred Time Zone by going to:
    Settings > Administration > Company

There, the company can decide which Time Zone they prefer to appear on every timestamp (including Work Orders, Purchase Order transactions, Meter readings, etc).

In addition, each user can set their own Time Zone Override allows the User to override the time zone chosen by the company, and have all dates in Lightning reflect a time zone that is different than the rest of the organization's database. 

Example:    Your company is in Texas, USA, and sets the database Time Zone to Central.  However, you work remotely in Florida, USA.  Since you want to see all the entries displayed in the Eastern Time zone, you use the Time Zone Override, to override what the company default displays

Go to Settings > Personal Settings > User Preferences > My Preferences

By default, the Time Zone Override is set to "None".   

• Click the drop-down arrow to display all the Time Zone options
• Select your preferred Time Zone
• Click   Save Changes    to lock in the change